MICROSTRUCTURAL CHARACTERISTICS OF 2-PHASE TITANIUM ALUMINIDES

被引：26

作者：

FENG, CR

MICHEL, DJ

CROWE, CR

机构：

[1] Materials Science and Technology Division, Naval Research Laboratory, Washington

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1991年 / 145卷 / 02期

关键词：

D O I：

10.1016/0921-5093(91)90255-L

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The microstructural characteristics of two-phase alpha-2 + gamma, conventional and XD-processed, titanium aluminides were investigated by transmission electron microscopy. The observed microstructures show that the two-phase material composition promotes the formation of alternating lamellae of alpha-2 and gamma corresponding to twin-related gamma-laths. The microstructures of XD materials suggest that the influence of excess boron dissolved from TiB2 particles was to reduce the alpha-2-gamma interfacial mismatch. The microstructural results demonstrate that deformation which occurs via the formation of alpha-2 layers and twin-realted gamma-laths, rather than via large populations of mobile dislocations, plays the primary role in the deformation behavior of the two-phase titanium aluminides and show that twin-related gamma-lath formation was very important to the capability of two-phase materials for continuous deformation.

引用

页码：257 / 264

页数：8

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